| Birstonas to Montemor-o-Novo | 1,859.00 mi (2,991.77 km) |
| Birstonas to Montemor-o-Velho | 1,801.27 mi (2,898.87 km) |
| Birstonas to Montijo | 1,882.58 mi (3,029.72 km) |
| Birstonas to Mortagua | 1,771.45 mi (2,850.87 km) |
| Birstonas to Moura | 1,857.25 mi (2,988.95 km) |
| Birstonas to Murtosa | 1,772.10 mi (2,851.93 km) |
| Birstonas to Nazare | 1,843.31 mi (2,966.53 km) |
| Birstonas to Nelas | 1,753.03 mi (2,821.23 km) |
| Birstonas to Obidos | 1,858.62 mi (2,991.16 km) |
| Birstonas to Odemira | 1,928.65 mi (3,103.87 km) |
| Birstonas to Odivelas | 1,887.62 mi (3,037.82 km) |
| Birstonas to Oeiras | 1,898.06 mi (3,054.64 km) |
| Birstonas to Olhao | 1,928.81 mi (3,104.12 km) |
| Birstonas to Oliveira de Azemeis | 1,761.02 mi (2,834.09 km) |
| Birstonas to Oliveira de Frades | 1,755.92 mi (2,825.88 km) |
